There has been several instances where I have been requested to create new forms in the R5 mail template. These forms have included Rich Text Body fields. On create using these new forms, a user's default email signature is appended to this rich text field. The Phone message and the bookmark are the only forms in the default mail template that do not have the signature added to the bottom of the body field. To add additional forms to the list of forms that should not have the appended you can achieve this through the CoreEmailClasses in the UIMemoDocument Declaration.
In the InsertSignature subroutine simply6 add to the following line:
Case "Bookmark", "Phone essage","MyForm1","MyForm2"